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Module 11

GraphQL with Spring

Beyond the certificate: a query language for your API.

An optional module on Spring for GraphQL: let clients ask for exactly the data they need in one request. Schema-first design, resolvers, the notorious N+1 problem and how batching solves it, mutations - and an honest look at when GraphQL beats REST, added as a catalog endpoint on BookVault.

5 Lessons in this stage1 h 11 min
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Lessons in this stage

  1. 01

    REST vs. GraphQL

    Intermediate

    Over-fetching, under-fetching, and endpoint sprawl - the problems GraphQL addresses by letting the client shape the response, and the trade-offs it brings.

    14 min
  2. 02

    Schema-First Design

    Intermediate

    GraphQL starts with a typed schema (SDL): object types, queries, and the contract that both client and server share.

    14 min
  3. 03

    Resolvers & Data Fetchers

    Advanced

    Wire schema fields to Java with @QueryMapping and @SchemaMapping, and how Spring for GraphQL resolves a nested query field by field.

    15 min
  4. 04

    The N+1 Problem & Batching

    Advanced

    GraphQL's per-field resolution makes N+1 queries dangerously easy; @BatchMapping and DataLoader coalesce them back into one efficient fetch.

    15 min
  5. 05

    Mutations & When to Choose GraphQL

    Intermediate

    Changing data with mutations, a word on subscriptions, and a clear-eyed verdict on when GraphQL is worth it versus a REST API.

    13 min